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Thank you for your letter regarding the recent reports of cell-site
simulators operating in the Washington, D.C. area. I share your
concern that cell-site simulators may be used unlawfully by foreign
actors and continue to monitor reports of their use.

The Department of Homeland Security has taken the lead in assessing
the potential threat from certain uses of cell-site simulators. For
example, the Department's April 2017 "Study on Mobile Device Security"
identified cell-site simulators as an existing and emerging
threat. And the Department's National Protection and Programs
Directorate recently confirmed for Senator Wyden that it continues to
assess the national security risks and vulnerabilities associated with
cell-site simulators, as well as methods to mitigate such risks. The
Commission stands ready to aid our federal partners at the Department
of Homeland Security, the Department of Justice, and the Federal
Bureau oflnvestigation in addressing this issue. If we had
particularized evidence that certain devices were being unlawfully
used within the United States, we would of course investigate the
matter alongside our federal partners and take all appropriate
enforcement actions.